Abstract In this paper, the impact of sunlight on stability and ligand field parameters of borosilicate glasses doped with NiO synthesized via melt quenching approach is reported. XRD analysis confirms the absence of any crystalline nature for the glass matrices. The average density (D), molar volume (Vm) and microstructural parameters were investigated. Optical features of these glasses were determined by measuring their absorption spectra in the visible-near infrared region. The absorption spectra of Ni2+ show four fundamental absorption bands that are associated with the wavenumbers ν1, ν2, ν3 and ν4 which attributed to; allowed electronic transitions ν1: 3A2g(F) → 3T2g(F), ν2: 3A2g(F) → 3T1g(F), ν3: 3A2g(F) → 3T1g(P) and forbidden transition ν4: 3A2g(F) → 1Eg(D). These absorption bands were availed to obtain Racah parameter (B) and ligand field splitting (Δ0). It was found that the average density and molar volume were decreased with further NiO doping. The impact of NiO doping on the glass color, B and Δ0 was determined. Additionally, the influence of sunlight on the glass % degradation, B and Δ0 was determined. All the investigated glass samples are stable under sunlight irradiation meanwhile stability has decreased with NiO increment. The glass sample with 1 NiO content has the lowest degradation % under sunlight and so is the most stable one; no change has been detected in the ligand field parameters. This study paves the way for understanding the impact of sunlight (solarization) on the stability, optical properties and ligand field parameters of glasses used for solar cells and smart widows.

中文翻译：

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阳光对镍硼硅酸盐玻璃光学性能和配体场参数的影响

摘要 本文报道了太阳光对熔融淬火法合成的NiO掺杂硼硅酸盐玻璃稳定性和配体场参数的影响。XRD 分析证实玻璃基质不存在任何结晶性质。研究了平均密度 (D)、摩尔体积 (Vm) 和微观结构参数。这些玻璃的光学特性是通过测量它们在可见-近红外区域的吸收光谱来确定的。Ni2+ 的吸收光谱显示了与波数 ν1、ν2、ν3 和 ν4 相关的四个基本吸收带，其归因于：允许电子跃迁 ν1: 3A2g(F) → 3T2g(F), ν2: 3A2g(F) → 3T1g(F), ν3: 3A2g(F) → 3T1g(P) 和禁止跃迁 ν4: 3A2g(F) → 1Eg( D)。这些吸收带可用于获得 Racah 参数 (B) 和配体场分裂 (Δ0)。发现随着进一步的 NiO 掺杂，平均密度和摩尔体积降低。确定了 NiO 掺杂对玻璃颜色、B 和 Δ0 的影响。此外，还测定了阳光对玻璃降解百分比、B 和 Δ0 的影响。所有研究的玻璃样品在阳光照射下都是稳定的，同时稳定性随着 NiO 的增加而降低。NiO含量为1的玻璃样品在阳光下的降解率最低，因此是最稳定的；在配体场参数中没有检测到变化。这项研究为了解阳光（日光化）对用于太阳能电池和智能寡妇的玻璃的稳定性、光学特性和配体场参数的影响铺平了道路。